My Geography teacher has started an experiment which involves me writing about what I have learnt in my lessons and about any geographical news that interests me. My Geography teacher is also going to write a blog about what she teaches me (and therefore what I should have learnt!) and hopefully the two blogs will match up. The idea is that this will not only help me to consolidate what I learn but that it will also help fellow students do the same and keep up to date with current issues.

Wednesday, 11 January 2012

Standard Deviation

STANDARD DEVIATION :- describes the average amount by which the values in a data set vary from the mean for that set.
---> It indicates the amount of clustering around the mean; showing how much the values are clustered allows the analysis of data to be taken much further than simply measuring central tendency.
In a normal tendency:-
- 68% of the values lie within +/- 1 Standard Deviation (SD) of the mean
- 95% of the values lie within +/- 2 SD of the mean
- 99% of the values lie within +/- 3 SD of the mean
---> A low SD indicates a more clustered distribution. A higher SD indicates a more spread-out/dispersed distribution.

Worked Example using Column B in AIB (Population density- persons per hectare)

Then, you need to subtract the mean, individually, from each of the values in the data set and then square the result. This can take a while but I find it easiest and quickest to do it in a little table....

x

4.42

18.52

16.73

22.02

38.44

24.29

36.64

37.99

23.04

(x-x-)2

535.00

81.54

117.07

30.57

118.59

10.63

82.63

109.00

20.34

x

53.24

33.66

37.07

34.97

20.61

27.76.

25.61

26.04

14.87

(x-x-)2

659.98

37.33

90.63

55.06

48.16

0.004

3.76

2.28

160.78

Next, you need to add up all the values on the bottom row of the table - the (x- xbar) squared results - and this gives you sigma (S)S = 2163.4

Then divide this value by (n-1), remembering than n = number of samples/values

2163.4/18-1 = 127.26

Then square root the result to give you your SD value,

Square root of 127.26 = 11.28

---> This result indicates that 68% of the population densities for the different regions of Poole lie within +/- 11.28 of the mean (27.55), illustrating large disparity across Poole in terms of population density.

---> Ideally when doing Standard Deviation you should complete one for two sets of data and compare the results (like you do for the Rivers fieldwork where you complete standard deviation for sediment size in pool's and riffles then compare the results, before using knowledge of Hjulstrom and velocity changes you recorded to explain why results deviate accordingly). So, as an example for Poole, if you calculate the standard deviation for 'owner occupied dwelling as % of total dwellings' (Column C) and 'rented from council or Housing Association as % of total dwellings' (Column D) you would see that Column C displays greater deviation than Column D, suggesting that across Poole, houses rented from the council are move evenly distributed than those privately owned and occupied, then using the background knowledge of Poole you have, you could try to explain why this trend occurs.

Geography Films

My Geography teacher is always reminding my class that watching (geography related) films can contribute to the 3 hours of reading time we are supposed to do each week. On both her blog and the Facebook page there are lists of recommended films and so I thought I would start to watch some of them and write a review on them from a student's perspective. If I would recommeded them to a fellow student then I will add the film to my own list below.......

- THE AGE OF STUPID (great film to watch for the energy module as it talks about climate change, energy consumption and production via some interesting case studies)

- THE COVE (this film is very thought provoking and presented the issues surrounding the dolphin trade - before watching this I didn't know a lot about the issue, especially the scale of it in Japan, and it left me feeling very shocked that something like this still exists today in such a developed country)

-ENCOUNTERS AT THE END OF THE WORLD (a great documentary with some simply stunning footage and interesting interviews that collectively provide an insight into life in Antarctica and the important research that is taking place)

-THE CONSTANT GARDENER (a rather sad story about how a drug company exploit the Kenyan population to allow them to test a new drug, despite the fact they know it has harmful side effects - good film for development and globalisation)

- ERIN BROCKOVICH (a good film that presents the negative impacts of the natural gas industry and the extent to which large companies are prepared to go to, to cover this up)

- SLUMDOG MILLIONAIRE (provides an insight into the life of children living in the Indian slums - good film to watch for development)

- GANDHI (a biopic about the life of Gandhi with particular reference to his prominent role in India's struggle for freedom from colonial rule)

- CRY FREEDOM (set in South Africa and tells the true story of Biko and his friendship with a white liberal newspaper editor - good film to watch for development)

- THE PAINTED VEIL (set in China, in the 1920's, and explores the impact of a cholera outbreak on a village, including references as to how religious beliefs make containing cholera even more challenging)

- BLOOD DIAMOND (set amid the explosive civil war overtaking 1999 Sierra Leone; it explores many issues including those surrounding the diamond trade, supply of arms to rebels and child soldiers - good film to watch for development and globalisation module)- THE DAY AFTER TOMORROW (after the Larsen B ice shelf collapses, the thermohaline circulation shutdowns, provoking glacial inception in the northern hemisphere - a good film to watch and then point out the geographical/scientific mistakes!)

- GOODBYE BAFANA (follows the unlikely friendship that forms between Mandela and his prision officer - good for development and globalisation)

- INVICTUS (after 27 years imprisionment, Mandela becomes South Africa's first elected president and this film follows his bid to unite the country via the rugby world cup - good film for development and globalisation)

- DARFUR (a group of international journalists travel to a village in Darfur in search of evidence to persuade the UN that genocide has occured but are forced to live after the Janjaweed turn up and threaten to kill them.... a film to watch for either development and globalisation or the population module but be warned it is very graphic)

Geography Books

I am a bit of a bookworm and often prefer reading a good book to watching a film and so (like I am doing with the Geography films) I am going to read some of the suggested books and write a review on them so I can comment on whether or not I think they are worth reading........

- AN INCONVENIENT TRUTH, Al Gore ( presents the issue of climate change and discusses how it has been caused and the impacts it is likely to have - well worth reading but if you prefer the film version is equally as a good)

- OUR CHOICE, Al Gore (this books follows on from An Inconvenient Truth by offering the solutions Al Gore thinks are required to solve the issue of Global Climate Change)

- THE BOY WHO HARNESSED THE WIND, William Kamkwamba and Bryan Mealer (tells the extraordinary true story of a Malawian teenager who overcame many obstacles to provide electricity and clean water for his village by capturing the energy in both the wind and the sun)

- BLOOD RIVER, Tim Butcher (tells the story of Tim Butchers quest to retrace the journey taken by H.M.Stanley in the 1870's. From this you get an insight into the history of the Congo and the factors that have effected its development - great book for the development and globalisation module as it provides an insight into the impact colonialism has had on Africa)

- GAIA, James Lovelock (presents the Gaia hypothesis which is the idea that the Earth functions as a living organism and so self-regulates to adapt to changing conditions - puts forward some very interesting ideas and really makes you think - it is worth a read!)

- THE REVENGE OF GAIA, James Lovelock (applies the Gaia hypothesis to global climate change - again an intriguing read which presents some interesting ideas and solutions to problems we are likely to face)

About Me

Whilst studying A-levels in Geography, Chemistry, Biology, Maths and History, I became completely fascinated by the Earth Sciences and found them particularly good for feeding my natural curiosity, providing answers to my never ending list of questions! Despite my relentless enthusiasm and frequent question asking, I was quite a quiet student in comparison to the rest of my class so my teacher asked me to start this blog as part of her experiment to test the benefits of incorporating social media into education. The aim was to find out if social networking can be a valuable educational tool and discover how much I actually learnt in lessons. It proved to be a huge success, for both myself and other students, with all my A-level notes still available for students use. I am currently at University studying BSc (Joint Honours) ‘Physical Geography with Oceanography’ and still asking way too many questions! In an attempt to continue to share my love for anything Earth Science-related, and to see if it can have the same benefits at Higher Education, I am trying to continue the blogging and use of social networking. I hope it proves to be a useful and interesting read!

The what, why and how of this blog.......

Hopefully you will have worked this out by now, but this blog is written from a student's perspective and, when combined with my teachers blog, should provide an insight into what I get taught - therefore what I should have learnt - in my Geography lessons. The idea is that this will make it a useful place to go to consolidate your learning; somewhere to go if you didn't quite understand something or missed a lesson. As well as this, posts will be written on anything of general geographical interest whether that be something currently in the news, anything related that I read or watch, anything I do or a topic that I just fancy finding out more about - all of this is designed to broaden our geographical knowledge. When it comes to revision I will try and write up as many notes as possible but it is unlikely that I will be able to cover everything so just let me know if there is anything you would like me to cover. So, thats what the blog is about (simply sharing, with anyone willing to read it, lots of geographical stuff that interests me!) and I am writing it because I tend to get a little enthusiastic about Geography and ask too many questions and so by channeling my interest in this way it will hopefully help you as much as it helps me!!! Whats the best way to use it? Well for starts reading/following the blogs and other resources is the only way you will benefit from them! Secondly, participate and get involved - comment on things, I am bound to get things wrong so correct me, you won't agree with everything I say so tell me what you think and perhaps even suggest things for me to read, watch or look into as I am always looking for new ways to extend my knowledge outside of the classroom. Geography is a discursive subject and, especially with human Geography, for the most part about forming/expressing opinions, so discuss the topics raised via the blogs etc. - trust me, its an easy way to learn!

I am now at University studying BSc (Joint Honours) Physical Geography with Oceanography - to keep my A-level notes separate I have started a new blog for current news and what I am learning in University - anything relevant I will also post on this blog, but please feel free to ask questions or requests posts! I hope students are still finding this a useful resource!

Disclaimer

'What I learnt in Geography this week.....' was created by, with content written by Vicki The Geography Student as part of an experiment conducted by Millie The Geography Teacher.

All posts published are my personal views, apart from where stated otherwise, and not those of the college I attended, my University or associated partners